Method for realizing high resolution degree three-dimensional imaging by projector producing translation surface fringe

Abstract

The invention relates to a method to realize high analysis 3D imaging from projector generating gliding plane array stripe. By using the scanning method of gliding the plane array stripe, two-value structure light stripe array would be generated, the plane array stripe would step move along the vertical scanning direction according to step distance b and frequency f that could be captured by video camera and image collecting card. Using the method of optical triangular surveying, the 3D data would be gained and accumulated to realize 3D imaging. The invention could be used to make high analysis 3D imaging sensor.

Description

technical field [0001] The invention relates to an imaging method in the field of optical technology, in particular to a method for generating translational array fringes by a projector to realize high-resolution three-dimensional imaging. Background technique [0002] Optical three-dimensional imaging technology is an important part of machine vision research. As the "eye" of automation technology, it has extremely wide applications in many fields. The high-resolution optical three-dimensional imaging system can obtain more three-dimensional data on the surface of the measured object within the effective field of view composed of the projection light path of the projection device and the receiving light path of the camera, so as to achieve the goal of high sampling accuracy in three-dimensional space . At present, the following high-resolution optical three-dimensional imaging methods are used in the field of active machine vision and have their own problems: (1) The metho...

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Problems solved by technology

At present, the following high-resolution optical three-dimensional imaging methods are used in the field of active machine vision and have their own problems: (1) The method of increasing the number of projected structured light fringes is adopted. When the number of projected fringes increases, the single projected fringe The narrower the width, it is limited by the imaging resolution of the imaging device itself and the front and rear occlusion of the unevenness of the object itself. When the number of stripes is too large or the width of a single structured light stripe is too narrow, it is very difficult for the computer to identify and the subsequent processing is complicated.

(2) The method of moving the optical three-dimensional imaging device or moving the measured object requires a large volume and high precision mechanical scanning device, resulting in a large volume, complex structure and high cost of the entire imaging system

(3) The method of changing the projection optical path of the projection device or the receiving optical path of the imaging device by rotating the swinging mirror, due to the addition of an optical scanning device, the system structure is complicated

(4) The method of interpolation and subdivision is adopted, the subsequent processing is complicated, and the data obtained by interpolation and the actual data have certain errors

(5) Although the phase shift method can also obtain a high-resolution 3D surface shape, it needs to know the phase of the reference surface, the calculation process is very complicated, and there is a crossover error

However, the structure of the above-mentioned device is relatively complicated, the quality of the laser itself and its installation are very high, the manufacturing and processing of the device is difficult, and the cost is high

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